generate thumbnail with white border VB.net/C#?

public Image AppendBorder(Image original, int borderWidth)
{
    var borderColor = Color.White;

    var newSize = new Size(
        original.Width + borderWidth * 2,
        original.Height + borderWidth * 2);

    var img = new Bitmap(newSize.Width, newSize.Height);
    var g = Graphics.FromImage(img);

    g.Clear(borderColor);
    g.DrawImage(original, new Point(borderWidth, borderWidth));
    g.Dispose();

    return img;
}